en:se-226
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— | en:se-226 [2019/11/17 19:22] (aktuell) – angelegt - Externe Bearbeitung 127.0.0.1 | ||
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+ | ====== SE-226 ====== | ||
+ | **SE-226**, **Racal Syncal TRA 921B** manpack radio; produced by [[Racal]]. | ||
+ | Under special conditions, when typical military VHF communication is not feasible, shortwave communications are still to be used, because ionospheric propagation typical can be used. For these special needs, the Swiss Army decided to acquire the shortwave manpack transceiver Racal Syncal TRA 921B, it got the military designation SE-226. | ||
+ | |||
+ | The transceiver can be used as manpack set on a carrying frame, installed on a vehile or in a fixed installation setting with an external inverted V dipole antenna. The SE-226 can be operated remotely by means of the FBA-227/412 remote control unit. | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ===== Technical Data ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Modes]]: [[A2]] (modulated telegraphy), | ||
+ | * [[Frequency range]]: 2000 - 7999 kHz, decadic frequency selector knobs , 1 kHz tuning steps | ||
+ | * [[Sensitivity]]: | ||
+ | * [[Output power]]: [[A2]] 15 Watts; [[A3]] 5/1 Watts; [[A3J]] 20/5 Watts | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Accumulator / Batteries]]: | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * mm, 11 kg | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | {{ : | ||
+ | * The standard antenna is a portable antenna (2,4 m whip antenna) or an inverted V dipole antenna on a 9 m mast. | ||
+ | * To charge the accumulator MA 948B, the charging unit **ALGT-226** (MA 945 X) is used, it can be powered from 12-15 V or 24-30 V DC or 198 - 231 V mains. | ||
+ | * **Speaker MA 988 B** increases the audio output to 500 mW, it is powered directly from the accumulator from the transceiver, | ||
+ | * The **Remote control FBA 227/412** (from the station material [[SE-227]]) can also be used to remotely control the SE-226. | ||
+ | {{ : | ||
+ | * Speech encryption is possible with the **[[SVZ-226]]**. | ||
+ | |||
+ | ===== Operation ===== | ||
+ | To operate the set, a well charged NiCd accumulator has to be mounted on the bottom part of the transceiver; | ||
+ | |||
+ | The microtel, the cable of the handset with headphone, microphone and an integrated push-to-talk button, has to be plugged in the socket in the left lower corner on the frontplate of the transceiver. The whip antenna or the cable of the dipole antenna are connected to the corresponding jack in the right upper corner of the frontpanel. | ||
+ | |||
+ | {{ : | ||
+ | VOICE LSB for single sideband operation. The same switch is used as mains switch. Four rotary controls in the upper row of controls are used to select the operation frequency. | ||
+ | |||
+ | In reception mode, the GAIN control is used to adjust the receiver volume. In transmission mode, HIGH or LOW POWER can be selected. When the mode switch is set to TUNE, the control TUNE ist used to tune the set to maximum antenna current. Then the transmission mode VOICE AM or VOICE LSB/USB is selected and a communications check can be performed. If the signal strength is sufficient, the transmittercan be set to reduced output power (LOW POWER), to save energy and enable a longer accumulator operation time. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | The antenna connector is protected by two antiparallel diodes from overloading. The antenna signal is mixed with the signal of the VCO, a PLL synthesizer, | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | In the mixer stage, the 10.7 MHz signal is mixed with the VCO output to generate the definite output RF signal. The subcarrier signal is eliminated and the RF signal is fed to the exciter and RF output stages. In position TUNE of the mode switch, the unmodulated signal is fed to the antenna tuning circuit. A variable inductance is used to tune the set to maximum antenna current, which is displayed on a small instrument. The transmitter can be traced by direction finding systems during this procedure, which is a serious drawback. | ||
+ | |||
+ | The VCO is a PLL synthesizer oscillating between 12,7 - 18,699 kHz, for the 10.7 MHz subcarrier, the 107th harmonic of a 100 kHz oscillator is selected. | ||
+ | |||
+ | ==== Component layout ==== | ||
+ | The transceiver is completely solid state. | ||
+ | |||
+ | ==== Development ==== | ||
+ | The Syncal TRA 921B has been developed by [[Racal]] in 1970/72, for the Swiss army, a number of 565 sets has been acquired, they were introduced in 1976/7; the speech scrambling system SVZ-226 was added in 1985. | ||
+ | ==== Field use ==== | ||
+ | {{ : | ||
+ | |||
+ | The SE-226 had mainly be used by parachutists of the alpine units and the sets have been withdrawn in 2004. | ||
+ | |||
+ | ---- | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technical Information ===== | ||
+ | * {{ : | ||
+ | |||
+ | ==== Further Information ==== | ||
+ | * [[http:// | ||
+ | * [[https:// | ||
+ | * [[https:// |
en/se-226.txt · Zuletzt geändert: 2019/11/17 19:22 von 127.0.0.1